I have been shooting Clays in revolvers for years and research located shows that Clays mimic the pressure curve of BP. It is a faster powder than Bullseye, and that seems to be what Quickload confirms.

Blue Dot is a magnum shotgun powder and offers a slower pressure build than Clays or BP. It would be interesting to plug that powder into Quickload to see what pressures are. I no longer have access to Quickload and wonder if one can calculate powder weights and peak pressure by inputting a desired velocity?

Paco Kelly @ Levergun.com was able to measure chamber pressures of revolver calibers using black powder and his results are some of the only referenced testing done for handguns. He tested a standard 45 Colt load of 37 grains of BP, under a 255 grain bullet, shot at over 900 fps and over 10,000 psi. He also loaded standard 44-40 and 44 Special loads with BP and measured about 10,000 psi shooting both. All said, 7000 psi and under is indeed a low pressure load.

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Gary
SWCA 2515